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- Question
Urea is formed only
Options- A. in liquid phase
- B. in vapour phase
- C. at very high temperature
- D. at very low pressure (vacuum)
- Correct Answer
- in liquid phase
- 1. Pick out the wrong statement.
Options- A. Electrical conductivity of refractory is not important, when these are to be used in electrical furnaces.
- B. Graphite and metals are the good electrical conductor among the refractories and others are all electrical insulators.
- C. Refractories used for lining electrical furnaces should ordinarily have very low electrical conductivity.
- D. Electrical conductivity of porous refractory material is low. Discuss
- 2. The open loop transfer function of a control system is
. This represents
Options- A. a first order system.
- B. dead time system.
- C. a first order time lag.
- D. a second order system. Discuss
- 3. Flow rate measurement of hostile acids and alkalis can be most suitably done by a/an
Options- A. venturimeter
- B. orificemeter
- C. magnetic flow meter
- D. hot wire anemometer Discuss
- 4. Natural silica
Options- A. mainly contains quartz.
- B. is not stable at high temperature.
- C. transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes.
- D. all (a), (b) and (c). Discuss
- 5. The pressure sensing element of elastic type pressure gauge is never made in the form of a
Options- A. bellow
- B. diaphragm
- C. strip
- D. Bourdon tube Discuss
- 6. Higher percentage of ash in coal meant for the production of metallurgical grade coke
Options- A. decreases the hardness of coke.
- B. decreases the abrasion resistance of coke.
- C. causes brittleness in steel.
- D. none of these. Discuss
- 7. High density refractory bricks have lower
Options- A. spalling resistance.
- B. thermal conductivity.
- C. fusion point.
- D. slag penetration resistance. Discuss
- 8. Cooling water fouling factors vary in the range of 0.001 to 0.003
Options- A. (BTU/hr.ft2 . °F)-1
- B. (kcal/hr.m2 .°C)-1
- C. (W/m2.°K)-1
- D. (kcal/hr. m. °C)-1 Discuss
- 9. Styrene butadiene rubber (SBR) as compared to natural rubber has
Options- A. poor tensile strength.
- B. poorer resistance.
- C. greater amount of heat build up heavy loading.
- D. all (a), (b) ana (c). Discuss
- 10. Nitrile rubber is produced by the polymerisation of
Options- A. acrylonitrile & butadiene.
- B. acrylonitrile & styrene.
- C. isobutylene & isoprene.
- D. none of these. Discuss
More questions
Correct Answer: Electrical conductivity of refractory is not important, when these are to be used in electrical furnaces.
Correct Answer: a first order system.
Correct Answer: magnetic flow meter
Correct Answer: all (a), (b) and (c).
Correct Answer: strip
Correct Answer: none of these.
Correct Answer: spalling resistance.
Correct Answer: (BTU/hr.ft2 . °F)-1
Correct Answer: all (a), (b) ana (c).
Correct Answer: acrylonitrile & butadiene.
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